View source: R/pattern2fixed.R
pattern2id | R Documentation |
Developer function to match regex, fixed or glob patterns against token types. This allows C++ function to perform fast searches in tokens object. C++ functions use a list of type IDs to construct a hash table, against which sub-vectors of tokens object are matched. This function constructs an index of glob patterns for faster matching.
pattern2fixed
converts regex and glob patterns to fixed patterns.
pattern2id(
pattern,
types,
valuetype = c("glob", "fixed", "regex"),
case_insensitive = TRUE,
keep_nomatch = FALSE,
use_index = TRUE
)
pattern2fixed(
pattern,
types,
valuetype = c("glob", "fixed", "regex"),
case_insensitive = TRUE,
keep_nomatch = FALSE,
use_index = TRUE
)
pattern |
a character vector, list of character vectors, dictionary, or collocations object. See pattern for details. |
types |
token types against which patterns are matched |
valuetype |
the type of pattern matching: |
case_insensitive |
logical; if |
keep_nomatch |
keep patterns that did not match |
use_index |
construct index of types for quick search |
a list of integer vectors containing indices of matched types
pattern2fixed
returns a list of character vectors containing
types
types <- c("A", "AA", "B", "BB", "BBB", "C", "CC")
pats_regex <- list(c("^a$", "^b"), c("c"), c("d"))
pattern2id(pats_regex, types, "regex", case_insensitive = TRUE)
pats_glob <- list(c("a*", "b*"), c("c"), c("d"))
pattern2id(pats_glob, types, "glob", case_insensitive = TRUE)
pattern <- list(c("^a$", "^b"), c("c"), c("d"))
types <- c("A", "AA", "B", "BB", "BBB", "C", "CC")
pattern2fixed(pattern, types, "regex", case_insensitive = TRUE)
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